CN116375389A - Hydration heat inhibitor for concrete and preparation method and application method thereof - Google Patents
Hydration heat inhibitor for concrete and preparation method and application method thereof Download PDFInfo
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- CN116375389A CN116375389A CN202310277538.6A CN202310277538A CN116375389A CN 116375389 A CN116375389 A CN 116375389A CN 202310277538 A CN202310277538 A CN 202310277538A CN 116375389 A CN116375389 A CN 116375389A
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- hydration heat
- concrete
- starch
- inhibitor
- heat inhibitor
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- 239000003112 inhibitor Substances 0.000 title claims abstract description 85
- 230000036571 hydration Effects 0.000 title claims abstract description 81
- 238000006703 hydration reaction Methods 0.000 title claims abstract description 81
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000002360 preparation method Methods 0.000 title abstract description 54
- 229920002472 Starch Polymers 0.000 claims abstract description 44
- 239000008107 starch Substances 0.000 claims abstract description 44
- 235000019698 starch Nutrition 0.000 claims abstract description 44
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 44
- 239000000413 hydrolysate Substances 0.000 claims abstract description 43
- 239000000654 additive Substances 0.000 claims abstract description 16
- 239000012629 purifying agent Substances 0.000 claims abstract description 14
- 239000002994 raw material Substances 0.000 claims abstract description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical group CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 66
- 239000012264 purified product Substances 0.000 claims description 51
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 38
- 238000002156 mixing Methods 0.000 claims description 38
- 239000000047 product Substances 0.000 claims description 30
- 102000004139 alpha-Amylases Human genes 0.000 claims description 23
- 108090000637 alpha-Amylases Proteins 0.000 claims description 23
- 229940024171 alpha-amylase Drugs 0.000 claims description 23
- 229920002261 Corn starch Polymers 0.000 claims description 19
- 239000008120 corn starch Substances 0.000 claims description 19
- 230000003301 hydrolyzing effect Effects 0.000 claims description 19
- 230000000415 inactivating effect Effects 0.000 claims description 18
- 102000004190 Enzymes Human genes 0.000 claims description 17
- 108090000790 Enzymes Proteins 0.000 claims description 17
- 238000001035 drying Methods 0.000 claims description 17
- 229940088598 enzyme Drugs 0.000 claims description 17
- 238000001914 filtration Methods 0.000 claims description 17
- 238000000227 grinding Methods 0.000 claims description 17
- 239000002002 slurry Substances 0.000 claims description 17
- 238000003756 stirring Methods 0.000 claims description 17
- 239000000463 material Substances 0.000 claims description 15
- 239000000126 substance Substances 0.000 claims description 10
- 102000004157 Hydrolases Human genes 0.000 claims description 9
- 108090000604 Hydrolases Proteins 0.000 claims description 9
- 230000007935 neutral effect Effects 0.000 claims description 9
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 8
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 8
- 230000000996 additive effect Effects 0.000 claims description 8
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 claims description 6
- ZCCIPPOKBCJFDN-UHFFFAOYSA-N calcium nitrate Chemical compound [Ca+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ZCCIPPOKBCJFDN-UHFFFAOYSA-N 0.000 claims description 6
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 3
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 3
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 3
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 3
- 239000004202 carbamide Substances 0.000 claims description 3
- 229910052943 magnesium sulfate Inorganic materials 0.000 claims description 3
- 235000019341 magnesium sulphate Nutrition 0.000 claims description 3
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 3
- 235000011152 sodium sulphate Nutrition 0.000 claims description 3
- 150000003839 salts Chemical class 0.000 claims description 2
- 239000004568 cement Substances 0.000 abstract description 8
- 230000000052 comparative effect Effects 0.000 description 12
- 230000002829 reductive effect Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000005336 cracking Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 4
- 239000010881 fly ash Substances 0.000 description 3
- 230000002401 inhibitory effect Effects 0.000 description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- 235000010755 mineral Nutrition 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 239000004382 Amylase Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- FCZCIXQGZOUIDN-UHFFFAOYSA-N ethyl 2-diethoxyphosphinothioyloxyacetate Chemical compound CCOC(=O)COP(=S)(OCC)OCC FCZCIXQGZOUIDN-UHFFFAOYSA-N 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/0068—Ingredients with a function or property not provided for elsewhere in C04B2103/00
- C04B2103/0089—Agents for reducing heat of hydration
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Polysaccharides And Polysaccharide Derivatives (AREA)
Abstract
The application relates to the field of concrete additives, and particularly discloses a hydration heat inhibitor for concrete, a preparation method and a use method thereof. The hydration heat inhibitor for the concrete is prepared from starch hydrolysate and additives, wherein the weight ratio of the starch hydrolysate to the additives is 100 (1-3), and the starch hydrolysate is prepared from the following raw materials: the starch, water, hydrolase and purifying agent, wherein the weight ratio of the starch to the water to the hydrolase is 100 (250-500) (0.02-0.08), and the volume ratio of the water to the purifying agent is 4:1. The hydration heat inhibitor for concrete can be used for concrete engineering, and has the advantages of effectively controlling the hydration heat release speed of cement and reducing the influence on the strength and setting time of the concrete.
Description
Technical Field
The application relates to the field of concrete additives, in particular to a hydration heat inhibitor for concrete, a preparation method and a use method thereof.
Background
The cement hydration process can release a large amount of heat, and the heat conduction performance of the concrete is poor, so that the concrete can form larger internal and external temperature difference in the temperature rising process, and larger shrinkage is easy to generate in the temperature dropping stage, so that the concrete is cracked. Especially in mass concrete, the temperature difference between the inside and the outside reaches more than 40 ℃ is a very common thing, and in order to prevent cracking, a low-temperature cement or embedded cooling water pipe mode is often used in site construction to control the cracking problem caused by temperature.
To solve the problem of temperature cracking of concrete caused by overlarge temperature rise, the concentrated heat release condition of cement needs to be improved, and the hydration process of the cement is regulated and controlled, so that heat generated by hydration has enough time to be released to the outside.
In recent years, researchers at home and abroad propose to regulate and control the hydration of concrete through a hydration heat inhibitor material so as to reduce the temperature rise of the concrete, so as to reduce or even avoid the risk of shrinkage cracking of the concrete, wherein the most widely applied hydration heat inhibitor is prepared by hydrolyzing starch-based materials.
Currently, the hydration heat inhibitor sold on the market generally causes the concrete setting time to be transitionally prolonged, thereby having negative influence on the development of the concrete strength.
Disclosure of Invention
In order to reduce the adverse effect of concrete setting time extension caused by adding the hydration heat inhibitor, the application provides the hydration heat inhibitor for concrete and a preparation method and a use method thereof.
In a first aspect, the present application provides a hydration heat inhibitor for concrete, which adopts the following technical scheme:
the hydration heat inhibitor for the concrete is prepared from starch hydrolysate and additives, wherein the weight ratio of the starch hydrolysate to the additives is 100 (1-3), and the starch hydrolysate is prepared from the following raw materials: the starch, water, hydrolase and purifying agent, wherein the weight ratio of the starch to the water to the hydrolase is 100 (250-500) (0.02-0.08), and the volume ratio of the water to the purifying agent is 4:1.
By adopting the technical scheme, the starch is hydrolyzed to form the small molecular chain, the gelatinization temperature is effectively reduced, the starch is hydrolyzed by the hydrolase to ensure that the molecular chain is not too short, the small molecular substance is purified by the purifying agent, and the hydrolyzed molecular chain and the additive act to further reduce the temperature, so that the influence on the strength and the setting time of the concrete is reduced while the hydration heat of the concrete is reduced.
Preferably, the starch is corn starch.
By adopting the technical scheme, the corn starch has the advantages of widest source, cheaper price and more application amount, the production cost of the selected corn starch is controllable, and the yield can be ensured.
Preferably, the hydrolase is one of a medium temperature alpha-amylase or a low temperature alpha-amylase, preferably a medium temperature alpha-amylase.
By adopting the technical scheme, the endo-amylase with the intermediate temperature alpha-amylase as a substrate is stable below 60 ℃ and has the optimal action temperature of 60-70 ℃, so that high reaction conditions are not required when the intermediate temperature alpha-amylase is used for hydrolyzing the starch, and the production difficulty is effectively reduced.
Preferably, the purifying agent is ethanol.
By adopting the technical scheme, ethanol is used as a purifying agent to dissolve possibly obtained minifene, and the product is further purified, so that the phenomenon that the molecular chain is too short is effectively reduced.
Preferably, the additive comprises alkaline substances such as sodium hydroxide, urea, ammonia water and the like or salt substances such as magnesium sulfate, sodium sulfate, calcium nitrate and the like.
By adopting the technical scheme, the gelatinization temperature of the product is effectively changed by adding the additive, so that the hydration heat regulation performance of the product is improved under the condition that the mechanical property and the working performance of the product on concrete are not influenced.
In a second aspect, the present application provides a method for preparing a hydration heat inhibitor for concrete, which adopts the following technical scheme:
a preparation method of a hydration heat inhibitor for concrete comprises the following steps:
s1, preparing starch into slurry with the mass concentration of 20% -40% by using water; adding hydrolase with the mixing amount of 0.02-0.08% of the starch mass, hydrolyzing for 2-4 h at 30-60 ℃, adjusting the pH value to 3, inactivating the enzyme for 30min, and adjusting the pH value to be neutral to obtain a hydrolysate;
s2, adding a purifying agent into the hydrolysate in the step S1, wherein the volume ratio of the adding amount of the purifying agent to the water consumption in the step S1 is 1:4, stirring for 30min, filtering out a product, drying and grinding at 105 ℃ to obtain a purified product, and the screen residue of the purified product is less than or equal to 0.4 percent according to a screen size of 1.18 mm;
s3, adding an additive with the mass fraction of 1% -3% into the purified product in the S2, and uniformly mixing to obtain the hydration heat inhibitor.
By adopting the technical scheme, S1 hydrolyzes starch to a certain extent, but does not need to hydrolyze the starch into shorter chain products by using high temperature and long reaction time, because in general, the molecular chain is shorter, the gelatinization temperature is lower, the effect is better when the starch is used in concrete, but the molecular chain is too short, the coagulation time and strength of the concrete are influenced, and S2 purifies small molecular substances possibly existing in the first reaction step; s3, the product with the gelatinization temperature higher than that in the first step reaction is reduced by adding an additive, so that the strength and the setting time are not influenced, and the effect of reducing the temperature can be ensured when the product is used in concrete.
Preferably, the substance used for adjusting the pH to 3 in the step S1 is one of hydrochloric acid or sulfuric acid.
By adopting the technical scheme, hydrochloric acid or sulfuric acid is used for inactivating the medium-temperature alpha-amylase, so that the continuous hydrolysis of starch is interrupted, the effect is quick, and the raw materials are easy to obtain.
Preferably, the substance used for adjusting the pH to be neutral in the step S1 is saturated sodium hydroxide solution.
By adopting the technical scheme, hydrochloric acid or sulfuric acid is neutralized, so that the prepared product is neutral, and the influence of acid and alkali on the performance of concrete is reduced.
In a third aspect, the application provides a method for using a hydration heat inhibitor for concrete, which adopts the following technical scheme:
preferably, the hydration heat inhibitor and the cementing material are mixed uniformly and then added into the concrete, and the mixing amount of the hydration heat inhibitor and the cementing material is 0.55 percent of that of the cementing material.
By adopting the technical scheme, the cementing material is added along with the cementing material in the concrete mixing process, and the operation is simple and convenient.
In summary, the present application has the following beneficial effects:
1. the temperature of the synthesized hydration heat inhibitor is generally lower, the reaction is mild, the time is short, the quality of the synthesized product is more stable, and finally, the gelatinization property of the product can be improved by adding the additive into the product after the reaction is finished, so that the stability and controllability of the hydration heat inhibitor are realized.
2. The preparation method of the hydration heat inhibiting material is simple and feasible, and is convenient for industrial mass production.
3. The hydration heat inhibitor material prepared by the method can greatly reduce the adiabatic temperature rise of concrete, and has no negative effect on the concrete setting time and strength development.
4. Compared with the traditional method, the method for preparing the hydration heat inhibitor material has the advantages that the preparation process is simple, the acid is prevented from being used in a large amount, and the method has remarkable progress in the simplicity and environmental protection of operation.
Detailed Description
The present application is described in further detail below with reference to examples.
Preparation example
Preparation example 1
The preparation example provides a hydration heat inhibitor, which is prepared by the following steps:
s1, preparing corn starch into slurry with the mass concentration of 20% by using water; adding medium-temperature alpha-amylase, wherein the mixing amount is 0.04% of the mass of starch, hydrolyzing for 2 hours at 30 ℃, adjusting the pH to 3, inactivating the enzyme for 30 minutes, and adjusting the pH to be neutral to obtain a hydrolysate;
s2, adding ethanol into the hydrolysate in the step S1, wherein the volume ratio of the ethanol addition amount to the water consumption in the step S1 is 1:4, stirring for 30min, filtering out a product, drying and grinding at 105 ℃ to obtain a purified product, and the screen residue of the purified product is less than or equal to 0.4 percent according to a screen size of 1.18 mm;
and S3, adding sodium hydroxide with the mass fraction of 1% into the purified product in the step S2, and uniformly mixing to obtain the hydration heat inhibitor.
Preparation example 2
The preparation example provides a hydration heat inhibitor, which is prepared by the following steps:
s1, preparing corn starch into slurry with the mass concentration of 30% by using water; adding medium-temperature alpha-amylase, wherein the mixing amount is 0.06% of the starch mass, hydrolyzing for 2 hours at 30 ℃, adjusting the pH to 3, inactivating the enzyme for 30 minutes, and adjusting the pH to be neutral to obtain a hydrolysate;
s2, adding ethanol into the hydrolysate in the step S1, wherein the volume ratio of the ethanol addition amount to the water consumption in the step S1 is 1:4, stirring for 30min, filtering out a product, drying and grinding at 105 ℃ to obtain a purified product, and the screen residue of the purified product is less than or equal to 0.4 percent according to a screen size of 1.18 mm;
and S3, adding sodium hydroxide with the mass fraction of 1% into the purified product in the step S2, and uniformly mixing to obtain the hydration heat inhibitor.
Preparation example 3
The preparation example provides a hydration heat inhibitor, which is prepared by the following steps:
s1, preparing corn starch into slurry with the mass concentration of 40% by using water; adding medium-temperature alpha-amylase, wherein the mixing amount is 0.08% of the starch mass, hydrolyzing for 2 hours at 30 ℃, adjusting the pH to 3, inactivating the enzyme for 30 minutes, and adjusting the pH to be neutral to obtain a hydrolysate;
s2, adding ethanol into the hydrolysate in the step S1, wherein the volume ratio of the ethanol addition amount to the water consumption in the step S1 is 1:4, stirring for 30min, filtering out a product, drying and grinding at 105 ℃ to obtain a purified product, and the screen residue of the purified product is less than or equal to 0.4 percent according to a screen size of 1.18 mm;
and S3, adding sodium hydroxide with the mass fraction of 1% into the purified product in the step S2, and uniformly mixing to obtain the hydration heat inhibitor.
Preparation example 4
The preparation example provides a hydration heat inhibitor, which is prepared by the following steps:
s1, preparing corn starch into slurry with the mass concentration of 40% by using water; adding medium-temperature alpha-amylase, wherein the mixing amount is 0.06% of the starch mass, hydrolyzing for 2 hours at 40 ℃, adjusting the pH to 3, inactivating the enzyme for 30min, and adjusting the pH to neutrality to obtain a hydrolysate;
s2, adding ethanol into the hydrolysate in the step S1, wherein the volume ratio of the ethanol addition amount to the water consumption in the step S1 is 1:4, stirring for 30min, filtering out a product, drying and grinding at 105 ℃ to obtain a purified product, and the screen residue of the purified product is less than or equal to 0.4 percent according to a screen size of 1.18 mm;
and S3, adding sodium hydroxide with the mass fraction of 1% into the purified product in the step S2, and uniformly mixing to obtain the hydration heat inhibitor.
Preparation example 5
The preparation example provides a hydration heat inhibitor, which is prepared by the following steps:
s1, preparing corn starch into slurry with the mass concentration of 40% by using water; adding medium-temperature alpha-amylase, wherein the mixing amount is 0.04% of the mass of starch, hydrolyzing for 2 hours at 50 ℃, adjusting the pH to 3, inactivating the enzyme for 30 minutes, and adjusting the pH to be neutral to obtain a hydrolysate;
s2, adding ethanol into the hydrolysate in the step S1, wherein the volume ratio of the ethanol addition amount to the water consumption in the step S1 is 1:4, stirring for 30min, filtering out a product, drying and grinding at 105 ℃ to obtain a purified product, and the screen residue of the purified product is less than or equal to 0.4 percent according to a screen size of 1.18 mm;
and S3, adding sodium hydroxide with the mass fraction of 1% into the purified product in the step S2, and uniformly mixing to obtain the hydration heat inhibitor.
Preparation example 6
The preparation example provides a hydration heat inhibitor, which is prepared by the following steps:
s1, preparing corn starch into slurry with the mass concentration of 40% by using water; adding medium-temperature alpha-amylase, wherein the mixing amount is 0.02% of the starch mass, hydrolyzing for 2 hours at 60 ℃, adjusting the pH to 3, inactivating the enzyme for 30min, and adjusting the pH to neutrality to obtain a hydrolysate;
s2, adding ethanol into the hydrolysate in the step S1, wherein the volume ratio of the ethanol addition amount to the water consumption in the step S1 is 1:4, stirring for 30min, filtering out a product, drying and grinding at 105 ℃ to obtain a purified product, and the screen residue of the purified product is less than or equal to 0.4 percent according to a screen size of 1.18 mm;
and S3, adding sodium hydroxide with the mass fraction of 1% into the purified product in the step S2, and uniformly mixing to obtain the hydration heat inhibitor.
Preparation example 7
The preparation example provides a hydration heat inhibitor, which is prepared by the following steps:
s1, preparing corn starch into slurry with the mass concentration of 40% by using water; adding medium-temperature alpha-amylase, wherein the mixing amount is 0.06% of the starch mass, hydrolyzing for 3 hours at 40 ℃, adjusting the pH to 3, inactivating the enzyme for 30min, and adjusting the pH to neutrality to obtain a hydrolysate;
s2, adding ethanol into the hydrolysate in the step S1, wherein the volume ratio of the ethanol addition amount to the water consumption in the step S1 is 1:4, stirring for 30min, filtering out a product, drying and grinding at 105 ℃ to obtain a purified product, and the screen residue of the purified product is less than or equal to 0.4 percent according to a screen size of 1.18 mm;
and S3, adding sodium hydroxide with the mass fraction of 1% into the purified product in the step S2, and uniformly mixing to obtain the hydration heat inhibitor.
Preparation example 8
The preparation example provides a hydration heat inhibitor, which is prepared by the following steps:
s1, preparing corn starch into slurry with the mass concentration of 40% by using water; adding medium-temperature alpha-amylase, wherein the mixing amount is 0.06% of the starch mass, hydrolyzing for 4 hours at 40 ℃, adjusting the pH to 3, inactivating the enzyme for 30min, and adjusting the pH to neutrality to obtain a hydrolysate;
s2, adding ethanol into the hydrolysate in the step S1, wherein the volume ratio of the ethanol addition amount to the water consumption in the step S1 is 1:4, stirring for 30min, filtering out a product, drying and grinding at 105 ℃ to obtain a purified product, and the screen residue of the purified product is less than or equal to 0.4 percent according to a screen size of 1.18 mm;
and S3, adding sodium hydroxide with the mass fraction of 1% into the purified product in the step S2, and uniformly mixing to obtain the hydration heat inhibitor.
Preparation example 9
The preparation example provides a hydration heat inhibitor, which is prepared by the following steps:
s1, preparing corn starch into slurry with the mass concentration of 40% by using water; adding medium-temperature alpha-amylase, wherein the mixing amount is 0.06% of the starch mass, hydrolyzing for 3 hours at 40 ℃, adjusting the pH to 3, inactivating the enzyme for 30min, and adjusting the pH to neutrality to obtain a hydrolysate;
s2, adding ethanol into the hydrolysate in the step S1, wherein the volume ratio of the ethanol addition amount to the water consumption in the step S1 is 1:4, stirring for 30min, filtering out a product, drying and grinding at 105 ℃ to obtain a purified product, and the screen residue of the purified product is less than or equal to 0.4 percent according to a screen size of 1.18 mm;
and S3, adding sodium hydroxide with the mass fraction of 2% into the purified product in the step S2, and uniformly mixing to obtain the hydration heat inhibitor.
Preparation example 10
The preparation example provides a hydration heat inhibitor, which is prepared by the following steps:
s1, preparing corn starch into slurry with the mass concentration of 40% by using water; adding medium-temperature alpha-amylase, wherein the mixing amount is 0.06% of the starch mass, hydrolyzing for 3 hours at 40 ℃, adjusting the pH to 3, inactivating the enzyme for 30min, and adjusting the pH to neutrality to obtain a hydrolysate;
s2, adding ethanol into the hydrolysate in the step S1, wherein the volume ratio of the ethanol addition amount to the water consumption in the step S1 is 1:4, stirring for 30min, filtering out a product, drying and grinding at 105 ℃ to obtain a purified product, and the screen residue of the purified product is less than or equal to 0.4 percent according to a screen size of 1.18 mm;
and S3, adding 3% sodium hydroxide into the purified product in the step S2, and uniformly mixing to obtain the hydration heat inhibitor.
PREPARATION EXAMPLE 11
The preparation example provides a hydration heat inhibitor, which is prepared by the following steps:
s1, preparing corn starch into slurry with the mass concentration of 40% by using water; adding medium-temperature alpha-amylase, wherein the mixing amount is 0.06% of the starch mass, hydrolyzing for 3 hours at 40 ℃, adjusting the pH to 3, inactivating the enzyme for 30min, and adjusting the pH to neutrality to obtain a hydrolysate;
s2, adding ethanol into the hydrolysate in the step S1, wherein the volume ratio of the ethanol addition amount to the water consumption in the step S1 is 1:4, stirring for 30min, filtering out a product, drying and grinding at 105 ℃ to obtain a purified product, and the screen residue of the purified product is less than or equal to 0.4 percent according to a screen size of 1.18 mm;
and S3, adding urea with the mass fraction of 2% into the purified product in the step S2, and uniformly mixing to obtain the hydration heat inhibitor.
Preparation example 12
The preparation example provides a hydration heat inhibitor, which is prepared by the following steps:
s1, preparing corn starch into slurry with the mass concentration of 40% by using water; adding medium-temperature alpha-amylase, wherein the mixing amount is 0.06% of the starch mass, hydrolyzing for 3 hours at 40 ℃, adjusting the pH to 3, inactivating the enzyme for 30min, and adjusting the pH to neutrality to obtain a hydrolysate;
s2, adding ethanol into the hydrolysate in the step S1, wherein the volume ratio of the ethanol addition amount to the water consumption in the step S1 is 1:4, stirring for 30min, filtering out a product, drying and grinding at 105 ℃ to obtain a purified product, and the screen residue of the purified product is less than or equal to 0.4 percent according to a screen size of 1.18 mm;
and S3, adding ammonia water with the mass fraction of 2% into the purified product in the step S2, and uniformly mixing to obtain the hydration heat inhibitor.
Preparation example 13
The preparation example provides a hydration heat inhibitor, which is prepared by the following steps:
s1, preparing corn starch into slurry with the mass concentration of 40% by using water; adding medium-temperature alpha-amylase, wherein the mixing amount is 0.06% of the starch mass, hydrolyzing for 3 hours at 40 ℃, adjusting the pH to 3, inactivating the enzyme for 30min, and adjusting the pH to neutrality to obtain a hydrolysate;
s2, adding ethanol into the hydrolysate in the step S1, wherein the volume ratio of the ethanol addition amount to the water consumption in the step S1 is 1:4, stirring for 30min, filtering out a product, drying and grinding at 105 ℃ to obtain a purified product, and the screen residue of the purified product is less than or equal to 0.4 percent according to a screen size of 1.18 mm;
s3, adding 3% of magnesium sulfate into the purified product in the S2, and uniformly mixing to obtain the hydration heat inhibitor.
PREPARATION EXAMPLE 14
The preparation example provides a hydration heat inhibitor, which is prepared by the following steps:
s1, preparing corn starch into slurry with the mass concentration of 40% by using water; adding medium-temperature alpha-amylase, wherein the mixing amount is 0.06% of the starch mass, hydrolyzing for 3 hours at 40 ℃, adjusting the pH to 3, inactivating the enzyme for 30min, and adjusting the pH to neutrality to obtain a hydrolysate;
s2, adding ethanol into the hydrolysate in the step S1, wherein the volume ratio of the ethanol addition amount to the water consumption in the step S1 is 1:4, stirring for 30min, filtering out a product, drying and grinding at 105 ℃ to obtain a purified product, and the screen residue of the purified product is less than or equal to 0.4 percent according to a screen size of 1.18 mm;
and S3, adding 3% sodium sulfate into the purified product in the step S2, and uniformly mixing to obtain the hydration heat inhibitor.
Preparation example 15
The preparation example provides a hydration heat inhibitor, which is prepared by the following steps:
s1, preparing corn starch into slurry with the mass concentration of 40% by using water; adding medium-temperature alpha-amylase, wherein the mixing amount is 0.06% of the starch mass, hydrolyzing for 3 hours at 40 ℃, adjusting the pH to 3, inactivating the enzyme for 30min, and adjusting the pH to neutrality to obtain a hydrolysate;
s2, adding ethanol into the hydrolysate in the step S1, wherein the volume ratio of the ethanol addition amount to the water consumption in the step S1 is 1:4, stirring for 30min, filtering out a product, drying and grinding at 105 ℃ to obtain a purified product, and the screen residue of the purified product is less than or equal to 0.4 percent according to a screen size of 1.18 mm;
and S3, adding 3% of calcium nitrate into the purified product in the step S2, and uniformly mixing to obtain the hydration heat inhibitor.
Table 1 preparation examples 1-15 raw material table
Examples
In the embodiment of the application, the cement is made of Adam P.O42.5R cement; the fine aggregate is river sand, medium sand and apparent density 2.62g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the The coarse aggregate is 5-31.5 mm continuous graded broken stone; the fly ash is class I fly ash; the mineral powder is S75 mineral powder.
Example 1
The embodiment provides concrete, which is prepared by mixing the following raw materials: 240kg of cement, 60kg of fly ash, 85kg of mineral powder, 815kg of sand, 1030kg of crushed stone, 170kg of water and 1.32kg of hydration heat inhibitor prepared in preparation example 1.
Example 2
This example provides a concrete which differs from example 1 in that: the hydrothermal inhibitor used was prepared in preparation example 2.
Example 3
The hydrothermal inhibitor used was prepared in preparation example 3.
Example 4
The hydrothermal inhibitor used was prepared in preparation example 4.
Example 5
The hydrothermal inhibitor used was prepared in preparation example 5.
Example 6
The hydrothermal inhibitor used was prepared in preparation example 6.
Example 7
The hydrothermal inhibitor used was prepared in preparation example 7.
Example 8
The hydrothermal inhibitor used was prepared as in preparation example 8.
Example 9
The hydrothermal inhibitor used was prepared as in preparation example 9.
Example 10
The hydrothermal inhibitor used was prepared in preparation example 10.
Example 11
The thermal inhibitor for hydration was prepared in preparation 11.
Example 12
The hydrothermal inhibitor used was prepared as in preparation example 12.
Example 13
The thermal inhibitor for hydration was prepared as in preparation example 13.
Example 14
The hydrothermal inhibitor used was prepared in preparation example 14.
Example 15
The hydrothermal inhibitor used was prepared as in preparation example 15.
Comparative example
Comparative example 1
This comparative example differs from example 1 in that: the hydration heat inhibitor is provided by Sichuan concrete road science and technology Co., ltd, and the model is SYZ-1.
Comparative example 2
This comparative example differs from example 1 in that: the hydration heat inhibitor is provided by Sichuan concrete road science and technology Co., ltd, and the model is SYZ-2.
Comparative example 3
This comparative example differs from example 1 in that: the hydration heat inhibitor is provided by Sichuan concrete road science and technology Co., ltd, and the model is SYZ-3.
Comparative example 4
This comparative example differs from example 1 in that: the hydration heat inhibitor is provided by Sichuan concrete road science and technology Co., ltd, and the model is SYZ-4.
A reference group was additionally provided, which was different from example 1 in that: no hydration heat inhibitor was added.
Performance test
The compressive strength of the concrete is detected by referring to GB/T50081-2019 Standard of test method for physical and mechanical properties of concrete; the setting time of the concrete is detected by referring to GB/T50080-2016 Standard for common concrete mixture Performance test method.
The concrete adiabatic temperature rise was tested using an adiabatic temperature rise instrument.
TABLE 2 adiabatic temperature rise, setting time and strength measurements for examples and comparative examples of the present application
It can be seen in combination with comparative examples 1-4 and the reference group and with table 2: the commercial hydration heat inhibiting material can reduce the heat insulation temperature rise value of 7d of the concrete by 7-9 ℃, but can obviously prolong the setting time of the concrete and reduce the strength of the concrete.
It can be seen in combination with the examples, comparative examples and reference groups and with table 2: compared with the commercial products, the hydration heat inhibiting material prepared by the method has more remarkable capability of reducing the temperature rise of the concrete, has no negative effect on the setting time and the strength development of the concrete basically, and even part of products can promote the strength development of the concrete.
The present embodiment is merely illustrative of the present application and is not intended to be limiting, and those skilled in the art, after having read the present specification, may make modifications to the present embodiment without creative contribution as required, but is protected by patent laws within the scope of the claims of the present application.
Claims (9)
1. The hydration heat inhibitor for the concrete is characterized by being prepared from starch hydrolysate and additives, wherein the weight ratio of the starch hydrolysate to the additives is 100 (1-3), and the starch hydrolysate is prepared from the following raw materials: the starch, water, hydrolase and purifying agent, wherein the weight ratio of the starch to the water to the hydrolase is 100 (250-500) (0.02-0.08), and the volume ratio of the water to the purifying agent is 4:1.
2. The hydration heat inhibitor for concrete according to claim 1, wherein said starch is corn starch.
3. The hydration heat inhibitor for concrete according to claim 1, wherein said hydrolase is one of a medium-temperature alpha-amylase or a low-temperature alpha-amylase.
4. The hydration heat inhibitor for concrete according to claim 1, wherein said purifying agent is ethanol.
5. The hydration heat inhibitor for concrete according to claim 1, wherein said additive comprises an alkaline substance such as sodium hydroxide, urea, ammonia water or a salt substance such as magnesium sulfate, sodium sulfate, calcium nitrate.
6. The method for preparing the hydration heat inhibitor for concrete according to any one of claims 1 to 5, comprising the steps of:
s1, preparing starch into slurry with the mass concentration of 20% -40% by using water; adding hydrolase with the mixing amount of 0.02-0.08% of the starch mass, hydrolyzing for 2-4 h at 30-60 ℃, adjusting the pH value to 3, inactivating the enzyme for 30min, and adjusting the pH value to be neutral to obtain a hydrolysate;
s2, adding a purifying agent into the hydrolysate in the step S1, wherein the volume ratio of the adding amount of the purifying agent to the water consumption in the step S1 is 1:4, stirring for 30min, filtering out a product, drying and grinding at 105 ℃ to obtain a purified product, and the screen residue of the purified product is less than or equal to 0.4 percent according to a screen size of 1.18 mm;
s3, adding an additive with the mass fraction of 1% -3% into the purified product in the S2, and uniformly mixing to obtain the hydration heat inhibitor.
7. The method for preparing a thermal inhibitor for concrete according to claim 6, wherein the substance used for adjusting the pH to 3 in S1 is one of hydrochloric acid and sulfuric acid.
8. The method for preparing a thermal inhibitor for concrete according to claim 6, wherein the substance used for adjusting the pH to neutral in S1 is a saturated sodium hydroxide solution.
9. The method of using the hydration heat inhibitor for concrete according to any one of claims 1 to 5, wherein the hydration heat inhibitor and the cementing material are mixed uniformly and then added into the concrete, and the mixing amount of the hydration heat inhibitor and the cementing material is 0.55 percent of that of the cementing material.
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